A given name, typically masculine, or the atomic mass unit (named after scientist John Dalton), abbreviated as 'Da'.
As a given name, from Old English 'dale' (valley) plus 'town,' a place name that became a surname. As a scientific unit, named after chemist John Dalton in recognition of his atomic theory work.
John Dalton, the scientist who proved atoms were real and developed atomic theory, is so important to chemistry that scientists named a unit of measurement after him—one dalton is the mass of a single proton or neutron!
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